PowerShell: how to grep command output?

Question

In PowerShell I have tried:

alias | select-string Alias

This fails even though Alias is clearly in the output. I know this is beca

Answer 1

PS> alias | Where-Object {$_.Definition -match 'alias'}

CommandType     Name                   Definition
-----------     ----                   ----------
Alias           epal                   Export-Alias
Alias           gal                    Get-Alias
Alias           ipal                   Import-Alias
Alias           nal                    New-Alias
Alias           sal                    Set-Alias

what would be contradict of match in PS then as in to get field not matching a certain value in a column